Siemens Sinamics G120P Operating Instructions Manual page 384

Functions
7.7 Application-specific functions
Figure 7-18
Set dynamic braking
In order to optimally utilize the connected braking resistor, you must know the braking power
that occurs in your particular application.
Table 7- 28
Parameter
p0219
p0844
384
Simplified representation of dynamic braking with respect to time
Parameter
Description
Braking power of the braking resistor (factory setting: 0 kW)
Set the maximum braking power that the braking resistor must handle in your particular
application.
Under certain circumstances, for low braking power ratings, the inverter extends the
ramp-down time of the motor.
Example: In your particular application, the motor brakes every 90 seconds. In so doing,
the braking resistor must handle a braking power of 50 kW for 20 s. Set the maximum
braking power to: p0219 = 50 (kW).
Note: As a consequence, the Vdc max controller is automatically deactivated (p1240 = 0
or p1280 = 0) the minimum ramp-down time (p1127) and the regenerative power limit
(p1531) are adapted.
No coast down / coast down (OFF2) signal source 1
p0844 = 722.x Monitor the overtemperature of the braking resistor with digital input x
of the Control Unit.
This requires that the thermoswitch of the braking resistor is con-
nected to digital input x of the Control Unit.
Inverter cabinet units
Operating Instructions, 12/2014, A5E32923362A